prepared by Urban Research Development Corporation

U.S. Dept. of the Interior, Bureau of Outdoor Recreation 1977

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For sale by the Supt. of Docs., U.S. Govt. Print. Off.] 1970 [1st revision

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Department of the interior Bureau of outdoor recreation and Department of the interior library

Dept. of the Interior Library; for sale by the Supt. of Docs., U.S. Gov. Print. Off. 1967-

v. 1. Citation item number 60001-60991, covering calendar year 1966 , v. 2. Citation item numbers 70000-70847, winter 1966-spring 1967 , v. 3. Citation item numbers 70848-71686, (1967) , v. 4. Citation item numbers 80001-81113, (1968)

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